Is there a dark side to happiness?

...people who strive for happiness may end up worse off than when they started... "when you’re doing it with the motivation or expectation that these things ought to make you happy, that can lead to disappointment and decreased happiness,” Gruber says. [...]

Too much happiness can also be a problem. One study followed children from the 1920s to old age and found that those who died younger were rated as highly cheerful by their teachers. Researchers have found that people who are feeling extreme amounts of happiness may not think as creatively and also tend to take more risks.